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Looks like an aftermarket setup to me....plus by 74, pickups were weened from the 8 3/4 and only the E body cars came with them but you can never say never when it comes to Mom and what they did on the line.
That is a 74 489 cone type suregrip with 3:55 gears. 8.75's were available as an option and were installed in all Mopars in 74 with the exeption of A-Bodies.